B4J Question In-Line Java Exception Handling

[GuyBooth]

I have some inline java code that looks like this:

public static void setTagContents(Tag tag, FieldKey fieldkey, String sContents) {
    try {
        if (sContents.length() > 0) {
            if (!tag.hasField(fieldkey)) {
                tag.addField(fieldkey, sContents);
            } else {
                tag.setField(fieldkey, sContents);
            }
        }
    }
 catch (Throwable e) {
    e.printStackTrace();
    }               
}

When it throws an error, the result is a very long stack trace in my B4J log. I would prefer to customize it so I have a single line in the log (e.g. "error thrown: Fieldkey does not exist").
Is there a simple way to do I do this?
What is the best way to handle exceptions with in-line java code?

 

[Daestrum]

Change

e.printStackTrace();

to

System.err.println(e.getMessage()); // print exception message to error stream

 

[Erel]

My recommendation is:

throw new RuntimeException(e);

This way you will be able to catch the error in your B4X code.

 

[GuyBooth]

My recommendation is:

throw new RuntimeException(e);

Right now I'm using

     catch (Throwable e) {
        System.out.println(e.getMessage());
    }

Which allows me to see a single line in the log.

This way you will be able to catch the error in your B4X code.

That would be useful - but how do I access the RuntimeException(e) from within B4J?

 

[Erel]

1. It is a mistake to catch errors inside libraries (unless you must) as it won't allow the developer to properly handle the exception.

2. In most cases the error should cause the app to crash. This way the developer will be able to fix it.

3. The error can be caught with a Try / Catch block.